code: def test_set_registered_model_tag_with_empty_string_as_value(client):
      name = "SetRMTagEmptyValueTest"
      client.create_registered_model(name)
      client.set_registered_model_tag(name, "tag_key", "")
      assert {"tag_key": ""}.items() <= client.get_registered_model(
          name
      ).tags.items()
  
imports: import time
  import pytest
  from mlflow import MlflowClient
  from mlflow.entities.model_registry import ModelVersion, RegisteredModel
  from mlflow.exceptions import MlflowException
  from mlflow.utils.os import is_windows
  from mlflow.utils.time import get_current_time_millis
  from tests.tracking.integration_test_utils import _init_server
label_desc: Use image node_id 9 for calling a global function with example usage: test_set_registered_model_tag_with_empty_string_as_value(client) without return types